From: Chen-Yu Tsai <wens@csie.org>
To: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>,
David Airlie <airlied@linux.ie>, Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Mike Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
devicetree <devicetree@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-clk <linux-clk@vger.kernel.org>,
linux-sunxi <linux-sunxi@googlegroups.com>
Subject: Re: [PATCH 01/15] clk: sunxi-ng: Add check for minimal rate to NM PLLs
Date: Mon, 26 Feb 2018 18:28:43 +0800 [thread overview]
Message-ID: <CAGb2v67X8BpvSbxj4So0fdPnY5c6yEKza6b=KZWf7qxMaOUXWg@mail.gmail.com> (raw)
In-Reply-To: <20180226102557.7bgjs3txp7cbridn@flea.lan>
On Mon, Feb 26, 2018 at 6:25 PM, Maxime Ripard
<maxime.ripard@bootlin.com> wrote:
> On Mon, Feb 26, 2018 at 05:43:01PM +0800, Chen-Yu Tsai wrote:
>> On Mon, Feb 26, 2018 at 5:38 PM, Maxime Ripard
>> <maxime.ripard@bootlin.com> wrote:
>> > Hi,
>> >
>> > On Sat, Feb 24, 2018 at 10:45:31PM +0100, Jernej Skrabec wrote:
>> >> Some NM PLLs doesn't work well when their output clock rate is set below
>> >> certain rate.
>> >>
>> >> Add support for that constrain.
>> >
>> > In such a case, you should round the rate to the minimum the clock can
>> > operate at, and not return an error.
>>
>> That's true for round_rate. But what's the expected behavior of set_rate?
>> AFAIK we presume all users call round_rate before set_rate, but that doesn't
>> seem to be true all the time.
>
> One of the first things that happens during a set_rate is a round_rate:
> https://elixir.bootlin.com/linux/v4.16-rc3/source/drivers/clk/clk.c#L1873
Ah! This was added recently in commit ca5e089a32c5 ("clk: use round rate
to bail out early in set_rate").
Thanks for the tip!
ChenYu
next prev parent reply other threads:[~2018-02-26 10:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-24 21:45 [PATCH 00/15] Implement H3/H5 HDMI driver Jernej Skrabec
2018-02-24 21:45 ` [PATCH 01/15] clk: sunxi-ng: Add check for minimal rate to NM PLLs Jernej Skrabec
2018-02-26 9:38 ` Maxime Ripard
2018-02-26 9:43 ` Chen-Yu Tsai
2018-02-26 10:25 ` Maxime Ripard
2018-02-26 10:28 ` Chen-Yu Tsai [this message]
2018-02-26 16:17 ` Jernej Škrabec
2018-02-24 21:45 ` [PATCH 02/15] clk: sunxi-ng: h3: h5: Add minimal rate for video PLL Jernej Skrabec
2018-02-24 21:45 ` [PATCH 03/15] clk: sunxi-ng: h3: h5: Allow some clocks to set parent rate Jernej Skrabec
2018-02-24 21:45 ` [PATCH 04/15] clk: sunxi-ng: h3: h5: export CLK_PLL_VIDEO Jernej Skrabec
2018-02-24 21:45 ` [PATCH 05/15] dt-bindings: display: sun4i-drm: Add compatibles for H3 HDMI pipeline Jernej Skrabec
2018-02-24 21:45 ` [PATCH 06/15] drm/sun4i: Add support for H3 display engine Jernej Skrabec
2018-02-24 21:45 ` [PATCH 07/15] drm/sun4i: Add support for H3 mixer 0 Jernej Skrabec
2018-02-24 21:45 ` [PATCH 08/15] drm/sun4i: Fix polarity configuration for DW HDMI PHY Jernej Skrabec
2018-02-26 9:39 ` Maxime Ripard
2018-02-26 16:19 ` Jernej Škrabec
2018-02-24 21:45 ` [PATCH 09/15] drm/sun4i: Add support for variants to " Jernej Skrabec
2018-02-24 21:45 ` [PATCH 10/15] drm/sun4i: Move and expand DW HDMI PHY register macros Jernej Skrabec
2018-02-24 21:45 ` [PATCH 11/15] drm/sun4i: Add support for H3 HDMI PHY variant Jernej Skrabec
2018-02-26 16:24 ` Jernej Škrabec
2018-02-24 21:45 ` [PATCH 12/15] drm/sun4i: Allow building on arm64 Jernej Skrabec
2018-02-27 2:18 ` kbuild test robot
2018-02-24 21:45 ` [PATCH 13/15] ARM: dts: sunxi: h3/h5: Add HDMI pipeline Jernej Skrabec
2018-02-24 21:45 ` [PATCH 14/15] ARM: dts: sun8i: h3: Enable HDMI output on H3 boards Jernej Skrabec
2018-02-25 8:11 ` [linux-sunxi] " Julian Calaby
2018-02-25 8:43 ` Icenowy Zheng
2018-02-25 9:06 ` Julian Calaby
2018-02-25 9:08 ` Icenowy Zheng
2018-02-26 16:16 ` Jernej Škrabec
2018-02-26 16:21 ` Icenowy Zheng
2018-02-26 16:27 ` Jernej Škrabec
2018-02-27 2:29 ` Julian Calaby
2018-02-27 7:07 ` Maxime Ripard
2018-02-27 10:35 ` Julian Calaby
2018-02-24 21:45 ` [PATCH 15/15] ARM64: dts: sun50i: h5: Enable HDMI output on H5 boards Jernej Skrabec
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